Nazareth House, Essex

The foundation solution was determined based on geotechnical conditions and structural requirements. Both Block A &B were proposed to be piled, this was due to an old basement on the site, which require removal, deepening the Made Ground and due to potential heave concerns in other areas of the site. SPEEDECK replaced the original piled scheme with a CFA Piled Raft as we could demonstrate this was the optimal foundation strategy for the site.

SPEEDECK were proactive in limiting the extent of heave precautions in areas of the site which didn’t require it, and where the old basement was to be dug out and removed. However, due to tree influence and desiccated shallow clay, heave protection was required for the western half of Block A.

• Foundation Type: Mixed voided & non-voided SFA piled raft foundation.
• Heave Protection: High volume change clay based void formers where required to the portions of the site affected by heave.
• Structural Stability: Limiting structural elements to cater only for those loads present, removing conservative over engineering.
• Environmental Considerations: Minimal excavation, reducing waste transport and environmental impact.

The piled raft foundation allowed significant cost and efficiency savings, reducing excavation work and material storage needs. Under-slab drainage and provisions for three lift pits were also incorporated into the foundation design.

Phase 1: Early Works & Ground Preparation (July – August)

• Initial blinding and piling commenced rapidly upon site handover.
• Efficient material storage and waste management ensured a clean and organised site.
• The client praised SPEEDECK’s site cleanliness and organisation.

Phase 2: Piling & Raft Construction (August – September)

• Drainage, lift pits & RC works were installed across the two blocks.
• Concrete pours were completed efficiently despite challenging weather conditions.
• Block B was completed first, with the client’s CEO visiting the site and commending the smooth operation.
• Block A was completed shortly after, with voided piled raft installation finalised in September.

Phase 3: Completion & Handover (September)

• Health and Safety inspections were successfully passed, reinforcing SPEEDECK’s commitment to high safety standards.
• The final concrete pours were completed, marking the completion of the foundation works.
• Client feedback was overwhelmingly positive, with high praise for operational efficiency and site management.